Primes in A103377.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =17a(5) =31a(6) =71a(7) =127a(8) =157a(9) =227a(10) =257a(11) =293a(12) =349a(13) =419a(14) =503a(15) =16007a(16) =32783a(17) =33329a(18) =80429a(19) =220919a(20) =786433a(21) =878831a(22) =85790399a(23) =10666238497a(24) =394760836573